小电流恒流源电路图.ewb

通信原理-高频电子电路CAI-340页-22.2M-ppt版.zip

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"小电流恒流源电路图（又称为微电流镜）" 
"        令BG2发射极负载电阻为0，避免R1的取值过大以及在工艺上为了制作高欧姆电阻而占用芯片面积过大。这种电流镜称为微电流镜。" 
"        由：	经过电阻R的电流：Ir=Is*exp（Ube2/UT）" 
"	BG1的集电极输出电流：Io=Is*exp（Ube1/UT）" 
"	Io*R1=Ube2-Ube1" 
"	可以求出R1=（UT/Io）*ln（Ir/Io）" 
"         它能在较大的参考电流下，提供很小的输出电流。当电源电压VCC变化而使参考电流Ir（经过电阻R的电流）   有较大的变化时，输出电流Io（从BG1的集电极输出的电流）的变化是很小的。可使运算放大器在电源电压变化很大的情况下维持正常工作。" 

EncryptionType: 2
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